Grid sizes: 60 x 60 cm, 60 x 90 cm, 60 x 120 cm;
Colors: white, beige, dark gray. Colors can be changed in the CoronaSelect map. Settings are available in the archive. 3 types of perforation. Material: MDF;
Inside is a simplified model of a radiator;
Polys screens 3000
Polys with radiators 226000
https://www.ozon.ru/product/ekran-na-batareyu-otopleniya-900h620h180-korob-s-figurnym-profilem-pro-lux-lotos-belyy-mdf-1774719067/?at=57twE4B6xcLk17Q9uzpB92VH2OwvLgc4RJYn5ImM31AZ 
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CoronaLegacyMtl - requires CoronaRender version 1.5 or higher
CoronaPhysicalMtl - requires CoronaRender version 7 or higher
The render shows Corona Physical.